appveyor.yml: Don't do RDP on failure

This makes the build just slow on failure.

Author: t-b

appveyor.yml

@@ -87,7 +87,7 @@ after_build:
 
 on_failure:
 #  RDP for failure
- - ps: $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+#  - ps: $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
 
 on_finish:
   #RDP for finish